Balance board



FIG. 1 is perspective view of a balance board showing my new design;

FIG. 2 is a front side elevation view thereof, the rear side elevational view being identical

FIG. 3 is a left side elevation view thereof, the right side elevational view being identical

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a balance board, as shown and described. 